Reverse drive



May 15, 1928. 1,670,144

T. S. EWART REVERSE DRIVE Fi1e d March 1.926

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Patented May 15, 1928.

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THOMAS S. EWART, OE RAYM O IIQ'D, WASHINGTON.

REVERSE DRIVE.

Application filed March 8, 1926. Serial, No. 92,99

The invention is a reverse drive employing roller chains and sprocket-s as the-oper A further object of the inventionis to provide a reverse drive in which the speed ratio in the device may be readily changed by varying the diameter of-the sprockets;

A furthenobj'ect of the invention 'is to provide va reverse drive in which all the parts are standard so'that they may readily be replaced. v

A still further object'of the invention is to provide a reverse drive in which the'parts may readily be changed toprovide greater orlesser strength, I

And a still further object of the invention is to provide a reverse drive which is of a simple and economical construction. With these ends in view theinvention-embodies cylindrical housing, "shafts penetrating each end of said housing, theend of one shaft being rotatahly mountediin the end of tlie'other, spro ck'ets onone ofthe said shafts; arms eztending outward" from the end'of the other of'the said shafts, sprockets at the outer endsof the said arms, station; ary sprockets on the interior of the said housing, roller chains connecting the saidsprockets at the ends of the arms to the said stationary sprockets, and also to the sprockets on the, end of the said shaft, and means for clamping and' holding the said housing. A I

Other features and advantages of'the' invention will appear "from the 'following description taken in connection with the drawings, wherein:

Figure 11s 'a'longitudinal' section through i the device.

Figure 2 is a cross section on line 22 of Figurel. j v r Figure ,3 is' a diagrammaticview showing an alternate arrangement of the driving sprockets.

Figure 4 is a's'ide view'of the device shown in Figure 3 showingthe relative positions of the sprockets.

"In thedrawlngs the device is shown as it would be made wherein numeral -1 indicates the housing, numeral 2 the drive shaft and numeral 3 the driven shaft; t l

The housing =1 is made asshown with a cylindrical outer shell and a web l adja cent one end; At the opposite end is a simi 'lar web which is indicated by the numeral 5 and which is held to the casing 1 by bolts 6' through a flange 7 at the periphery of theweb. I v j The web 4 is provided with a hub 8 in which the shaft 2 is rotatably mounted through a bearing 9. Atthe inside of the bearing the shaft recessed as shown at the point 10 and on the recessed part are two sprockets 11 and 12 which are held to the shaftby bolts 13' as shown, and beyond this portion the shaft is again recessed asshowrn at the point 14: and bearings-15 are mounted upon it, which are heldinplace by a washer 16 and a screw-17. Thebearings 15 are mounted in an opening 18 in a sleeve 19 which is splined' to the inner end of the shaftfias shown-atthe point 20. y 1 The sleeve :19'is provided with outwardly extending -ar1ns21 "and 22 which have sprockets 'rotatably mounted on spindles 23v and 2 4 at their outerends;

I I It will be noted that one sprocket which is indicated by the numeral 25, at the outer- .end of the arm 21 isin line with-ithe sprocket 11 so that a roller chainma'y pass around thetwo sprockets, and another sprocket26-at the; outer end of the arm 22 is in-line with the sprocket 12 so u that a roller chainlasindicated by the numeral 27, may pass around it. It is also understoodithat the member 19 may be'provided withanynumber of arms having similar sprockets at the outer ends. and as many sprockets will be placed upontheshaft 2 as there" are arms so that the sprocket at the outer endof-each armwill be independently driven. a 1 It is also understood that'all of the sprockets at the outer-ends of the arms may hein line as shown-in Figures 3 and 4 and a con-i tinuous chain as indicated by the numeral 28 may pa-Ss ar'0und them as shown. In this design aspr'ocketu29 is-placedon the main drive shaft which is indicated by the numeral 30, and other sprockets 31, 32 and 33 are placed ,at the outer ends of the arms so that a continuous chain 28 will engage all of the sprockets and as the sprocket 29 isv rotated it will cause the sprockets 31, 32 and 33 to rotate also. The'sproekets 31, 32 and 33 are connected by individual chains to other sprockets 34, 35 and'36 on a tubular shaft 37, as shown in Figure 1, and it will be observed that as the shaft 30 is rotated and the sprockets 31, 32 and 33 supported on thearms of a spider as shown in Figure 1, the tubular shaft 37 will be rotated in the opposite direction. The positions of the w sprockets 31, 32 and 33 are distorted and their supporting arms omitted in Figure 4 for the purpose of illustration.

' At. the opposite ends of the arms 21and '22 are other sprockets which are connected by chains to stationary sprockets 1n .the

housing.- At the end of the arm 21 is a sprocket 38 which is in line, with a sprocket 39 and .at the end of the arm 22 is a sprocket l that'is in line with a sprocket 41 so that as chains areplaced over the sprockets 38 and 39 and also over the sprockets 4:0 and ll the stationary sprockets 39 and ll will hold the chains and cause the. arms 21 and 22 i to rotate the member 19 in a direction opposite to that of the shaft 2. The sprockets 39 and 41 are held to a ring 12 by bolts 43 and the ring 12 is-keyed to a hub at the center of the web by a key 44, as shown in dotted lines. The sprockets 39 and 41 are mounted upon a bearing 45in a recess in the outersurface of the member 19.

At the'ends of the housing 1 are brake rings 46 and47 having friction rings 48 and 49 recessed'therein. The ring 46 is rigidly attached to, the member '19 and held by a pin50 as shown and the ring 47 is slidable on'a member5l which has arms 52 screwed on its outer end through a ring 53.

vLevers 5 1- are pivotally attached to the outer ends of the arms o2 and these are provided with projections 55 whichengage a pro- 'jection 56 on the ring 17. The levers 54 are operated through a sliding sleeve 57 to which they are attached by levers 58. The sleeve 57 may readily be moved to operate the clutch in any desired manner.

On the outer surface of the housing 1 is a brake band 59 which may also be arranged and-operated in any suitable manner to hold the housing rigid to a frame inwhich the made in the construction Without departing from the spirit of the invention. "One of which changes may be in the design or arrangement of the housing, another may be in the arrangement of the sprockets or chains, and "still another may be inthe use of a different type of clutch mechanism.

The construction will be readily understood from the foregoing description. To

use the device it maybe arranged and assembled as shown, and it will be observed that asthe driving shaft 2 is rotated itwill in turn rotate the sprocket-s on the arms 21 and 22 and as the sprockets on the other'ends of these arms are held by the stationary sprockets on the housing through chains 50, the

when it is desired to driveboth shaftsinthe same direction the clutch may be operated to grip both ends of the housing so that both of these shafts and the housing will rotate at the same speed; while at the same time it will be possible to'readily release the'clutch and grip the housing by the brake band to reverse the direction of the shaft 3 Having thus fully described the invention, what I claim as new and Letters Patent, is: 1

1. In a device for changing the direction of a portion of a rotating shaft, a cylindrical housing, a drivin shaft having one end journ aled in the said housing, a driven shaft,

also having one end journaled inthe said housing, a member with outstanding arms attached to the end of the said driven shaft,

sprocketsin the outer ends of the said out-' other sprockets on'the ends of shafts rotatably mounted and remotely held in outstanding arms from the said driven shaft chains connecting the sprockets on the drive shaft with the sprockets in the outstanding arms, other sprockets on the other ends of the rotatably mounted shafts in the outstanding desire to secure by ll l arms, and otherstationary sprockets, said sprockets being connected' bysuitable roller chainsto the lattersprock'ets on shafts in the outstanding arms, and said; stationary sprockets "being attached to suitable means for holding them stationary.

3. 111 a device for reversing the direction of a portion of a'jshaft, a sprocket on the drive portion of the saidsha-ft, other sprockets freely and remotely held in outstanding arms from the said driven portion of" the I shaft, another, sprocketfixedly mounted in relation tothe said shaft and suitable chains connecting some of the said sprockets in the outstanding arms to the sprocket on the drive portion of the shaft and some to the fixedly mounted sprocket.

4. In a reverse drive mechanism, a drum shaped housing a drive shaft journaled in one end of thesaid housing, a driven shaft journaled in the opposite end of the said housing and abutting the said drive shaft,

means on both of the said shafts for friction- I ally grippingthe ends of thesaid housing to the said drive shaft chains connecting these sprockets to the sprockets in the said arms, other sprockets fixedly mounted in the said housing, and other chains connecting the fixcause the said housing and shafts to rotate as a unit, other means for holding the housing stationary While the said shafts rotate, outstanding arms at the end of the said driven shaft, sprockets rotatably mounted in the said arms, other sprockets on the end of i for holding the housing stationary While the said shafts rotate, a sleeve in the said housing splined to the said driven shaft, said sleeve having outwardly projecting arms, sprockets rotatably mounted in the outer ends of the said arms, other sprockets on the said drive shaft for rotating certain of the said sprockets on the said arms, other sprockets stationary in the said housing for holding certain of the said sprockets on the said arms and suitable chains connecting the said sprockets. i

6. In a reverse drive mechanism, a housing, a drive shaft journaled in the said housing, a driven shaft abutting the end of the said drive shaft and also journaled in the said housing, a clutchmechanism comprising friction discs engaging the external surfaces of the ends of the housing With one disc held on the said driven shaft and the other on the said drive shaft, a brake operating on the outer surface of the said housing for holding the housing stationary, transmission meanson {the endzof the stamina shaft, aspider avith; outstanding arms on Ltheend of the said driven shaft, transmission means at the ends of the said arms cooperating with the transmission means on the said drive I shaft'andother transmission means station ary in the Said'housing cooperating/With the said transmission means at the ends of the said-arms. I i

7: ln a reverse drive mechanism, a cylin" drical housing, a drive shaft entering"the sald housmg from one end and ournrled lIl the-center of the end thereof, "ti-driven shaft avith outstanding arms in the said housing jonrnaled in the said housing and, on the end of the said drive shaft and entering the said housing from the end opposite to that of the. drive shaft, shafts rotatably mounted in the outer ends of the said arms of the said driven shaft, rotatable means connecting the said shafts to the said drive shaft, otherrotatable means connecting the said shafts to a stationary device Within the said housing, clutch mechanism comprising friction discs mounted on the said drive and driven shafts and engaging the'ends of the said housing anda suitable brake mechanism engaging the cy lindrical surface of the said housing.

8. In a reverse drive'of the class described,

a drum shaped housing, a drive shaft ente'ring one end of the said housing and journaled thereima driven shaft entering the op posite end of the saidhousing andjournaled therein, means for holding the said housing to rotate as a unit with. the said drive and driven shafts, other means for holding the said housing stationary, outstanding arms in the said housing and fixedly attached to the said driven shaft, sprockets, rotatably mounted in the outer ends of the said arms,

other sprockets on the end of the said'drive shaft and adaptable to cooperate With the sprockets in the arms through chains, other sprockets fixedly attached to'the said housing, and also adaptable to cooperate with the sprockets at the ends of thesaid arms and suitable chains connecting the said sprockets.v a

9. In a reverse drive of theclass described, a drum shaped housing, a drive shaft enter lng one end of the saidjhousingand journaled therein, a driven shaft entering the opposite end of the said housing and journaled therein, outstanding arms in the said housing and fixedly attached to the said driven shaft, sprockets rotatably mounted in the outer ends of the said arms, other sprockets on the end of the said drive shaft and adaptable to cooperate With the sprockets in the arms throughvchains, other sprockets fixedly vattached to the said housing, and also adapt,

able to cooperate with the sprockets at the ends of the said arms through chains, a

clutch'mechanism engaging both ends of the said housing to cause the said housing to ro- Hill lit)

tate With the said shafts as a unit, and abrake band around the said housing to hold the housing stationary. V

a 10. In a reverse drive of the class de-; scribed, a drum shaped housing, a drive shaft entering one end ofthe said housing and journale'd therein, a driven shaft entering the opposite end of the said housing and journaled therein, outstanding arms in the said housing and fixedly attached to the said driven shaft, sprockets rotatably mounted in the outer ends of the said arms, other sproek-' ets onthe end of the said drive shaft yand adaptable to cooperate with the sprockets in the arms through chains, other sprockets fixedly attached to the said housing, andalso adaptable to cooperate with the sprockets at the ends of thesaid arms through chains,

means fol-gripping and holding the said.

housing; and a clutch mechanism engaging both ends of the said housing. to cause the I c THOMAS so. EWARTQ 

